after 1st occurrence, had regular service and replaced air filter. Problem recurred next time truck was in slow/standstill city traffic. To mechanic again,diagnostic computer identified a problem with speed sensor in the transmission. Sensor replaced and trans fluid changed. (approx. $400)and problem has resurfaced in less than 1 week - all occurrences in slow/standstill city traffic (approx. 150,000 kms)

Loss power would not move go dead in drive put in neutral idle fine step on gas pedal black smoke started comming from tail pipe killed truck crank back up and has been running ever since but still is blowing black smoke out of tail pipe when idle and when u press gas more smoke pours out of pipe what could this be put a can of sea foam in tank after this started thinking bad fuel maybe

that sounds like you are going over the rumble strips( but not as loud) on the highway. I checked the front end and everything is fine, It comes and goes, doesn't effect the braking or steering. the strangest thing is it's the same at 50 or 10mph. I had a friend that siad it could be the drive shaft,checked the universals they seem fine, and he said it could be the, what I would call the metal collar with rubber at the rear part of the shaft, like a harmonic balancer. any thoughts or questions, anyone ever heard of this??